Nonunit Distance Protection Algorithm for Multiterminal MMC-HVdc Systems Using DC Capacitor Resonance Frequency

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Author(s):	Lacerda, Vinicius A. ; Monaro, Renato M. ; Pena-Alzola, Rafael ; Campos-Gaona, David ; Coury, Denis, V Total Authors: 5
Document type:	Journal article
Source:	IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS; v. 69, n. 12, p. 10-pg., 2022-12-01.
Abstract
High-voltage dc (HVdc) transmission has been largely used to interconnect asynchronous systems and integrate renewable energy resources into electrical grids. However, the high short-circuit currents and low-tolerance of power electronics equipment impose new challenges for these systems' protection. To address these challenges, a new distance protection algorithm for HVdc grids with modular multilevel converters (MMCs) is proposed in this article. The proposed algorithm identifies the faulty line/cable using the resonance frequency of a dc capacitor installed in each terminal. The technique was tested in a four-terminal HVdc grid with five cables and ten circuit breakers. The algorithm was highly selective for faults in the lines and provided fast identification, in less than 1 ms, without communication amongst terminals. The algorithm was tested in hardware under high-noise conditions and provided reliable results. (AU)

FAPESP's process:	15/21167-6 - Fault detection, fault location and intelligent protection of multiterminal HVDC lines
Grantee:	Vinícius Albernaz Lacerda Freitas
Support Opportunities:	Scholarships in Brazil - Doctorate (Direct)